On-vehicle camera lens glass material and on-vehicle camera lens

• US 8,077,406 B2
• Filed: 03/19/2008
• Issued: 12/13/2011
• Est. Priority Date: 03/20/2007
• Status: Active Grant

• Current Assignee: Hoya Corporation
• Original Assignee: Hoya Corporation
• Inventors: Hachitani, Yoichi, Tachiwana, Kazuo
• Primary Examiner(s): Sugarman, Scott J
• Assistant Examiner(s): Patel, Vipin
• Application Number:
  US12/050,985
• Publication Number:
  US 20080231972A1
• Time in Patent Office: 1,364 Days
• Field of Search: 359/809, 501/11
• US Class Current: 359/809
• CPC Class Codes: B60R 1/00 Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
• CPC Class Codes: B60R 2300/802 for monitoring and displaying vehicle exterior blind spot views
• CPC Class Codes: C03C 3/068 containing rare earths
• CPC Class Codes: C03C 3/097 containing phosphorus, niobium or tantalum

Abstract

An on-vehicle camera lens glass material satisfies at least one of conditions in which a measurement result in water resistance based on a powder method prescribed by Japanese Optical Glass Industrial Standard is 1^st Class, a measurement result in Knoop hardness based on a measurement method prescribed by Japanese Optical Glass Industrial Standard is 6^th Class or higher, a measurement result in solarization based on a measurement method prescribed by Japanese Optical Glass Industrial Standard is 2% or less, and a measurement result in average linear expansion coefficient based on a measurement method prescribed by Japanese Optical Glass Industrial Standard is 100×10⁻⁷° C.⁻¹ or less.

Claims

1. An on-vehicle camera lens glass material for use in an on-vehicle camera lens,

wherein the on-vehicle camera lens glass material is configured such that a measurement result of acid resistance based on a powder method prescribed by Japanese Optical Glass Industrial Standard, is 1^st Class or 2^nd Class;

and

wherein the on-vehicle camera lens glass material contains;

0.1 to 45% by weight of SiO₂;

0.1 to 25% by weight of B₂O₃;

0.1 to 20% by weight of ZrO₂;

0 to 50% by weight of La₂O₃;

0 to 30% by weight of Nb₂O₅; and

the on-vehicle lens glass material satisfies at least one of following conditions;

a measurement result of Knoop hardness based on a measurement method prescribed by Japanese Optical Glass Industrial Standard, is 6^th Class or higher; and

a measurement result of solarization based on a measurement method prescribed by Japanese Optical Glass Industrial Standard, is 2% or less.

2. The on-vehicle camera lens glass material according to claim 1,

wherein the on-vehicle camera lens glass material additionally satisfies at least one of following conditions:

a measurement result of water resistance based on a powder method prescribed by Japanese Optical Glass Industrial Standard, is 1^st Class; and

a measurement result of average linear expansion coefficient based on a measurement method prescribed by Japanese Optical Glass Industrial Standard, is 100×

10<sup>−

7</sup>°

C.<sup>−

1</sup> or less.

3. The on-vehicle camera lens glass material according to claim 1, wherein the on-vehicle camera glass material includes a total content of SiO₂ and ZrO₂ that is 10% by weight or more.

4. The on-vehicle camera lens glass material according to claim 1, wherein the on-vehicle camera glass material includes transparent crystallized glass.

5. The on-vehicle camera lens glass material according to claim 1, wherein the on-vehicle camera glass material includes a total content of TiO₂, Nb₂O₅, Ta₂O₅, and ZrO₂ that is 20% by weight or more.

6. The on-vehicle camera lens glass material according to claim 1, wherein the on-vehicle camera glass material further contains:

at least one of Al₂O₃, Li₂O, Na₂O, K₂O, MgO, CaO, SrO, BaO, ZnO, TiO₂, La₂O₃, Gd₂O₃, Y₂O₃, Ta₂O₅, WO₃, Sb₂O₃, SnO₂, and F.

7. The on-vehicle camera lens glass material according to claim 1, wherein of the on-vehicle camera lens glass a refractive index material with respect to line d is 1.70 or more.

8. An on-vehicle camera lens, wherein at least a first lens close to an object point is made of the on-vehicle camera lens glass material, according to claim 1.

9. The on-vehicle camera lens according to claim 8, wherein a photocatalytic film is formed on at least a first surface, which is close to the object point, of the first lens.

10. The on-vehicle camera lens according to claim 8, wherein a hard coat film is formed on at least a first surface, which is close to the object point, of the first lens.

11. The on-vehicle camera lens according to claim 8, wherein a hard coat film and a photocatalytic film are formed on at least a first surface of the first lens, which is close to the object point.

12. The on-vehicle camera lens according to claim 8, wherein at least one surface of the first lens is formed as an aspheric surface.

13. An on-vehicle camera lens glass material for use in an on-vehicle camera lens, wherein the on-vehicle camera lens glass material is configured such that

a total content of CeO₂ and Fe₂O₃ is in a range of 0.1 to 1% by weight;

and

wherein the material contains;

0.1 to 45% by weight of SiO₂;

0.1 to 25% by weight of B₂O₃;

0.1 to 20% by weight of ZrO₂;

0 to 50% by weight of La₂O₃; and

0 to 30% by weight of Nb₂O₅.

14. The on-vehicle camera lens glass material according to claim 13, wherein a refractive index of the on-vehicle camera lens glass material with respect to line d is 1.70 or more.

15. An on-vehicle camera lens, wherein at least a first lens close to an object point is made of the on-vehicle camera lens glass material, according to claim 13.

16. The on-vehicle camera lens according to claim 15, wherein a photocatalytic film is formed on at least a first surface, which is close to the object point, of the first lens.

17. The on-vehicle camera lens according to claim 15, wherein a hard coat film is formed on at least a first surface, which is close to the object point, of the first lens.

18. The on-vehicle camera lens according to claim 15, wherein a hard coat film and a photocatalytic film are formed on at least a first surface of the first lens, which is close to the object point.

19. The on-vehicle camera lens according to claim 15, wherein at least one surface of the first lens is formed as an aspheric surface.